Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=false and idempotentHint=true, and the description is consistent with them ('opens nothing by itself'). Beyond the annotations it discloses the return content (screens, buttons, fields) and explains why browser tools are required (My PT Hub publishes no public API), which is genuinely useful context. It stops short of describing the guide's format or any length/rate constraints, so it is not a 5.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The core workflow is front-loaded in the first two sentences, but the closing line 'My PT Hub's official API: My PT Hub publishes no public API' is redundant and awkwardly phrased, and 'from ChatGPT, Claude or any AI agent' is marketing filler that does not help an agent decide or act.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a zero-parameter tool with no output schema, the description must carry the burden of explaining what comes back, and it does (a step-by-step guide of screens, buttons and fields). Coupled with the annotations and the pointer to the browser tools that complete the task, an agent has enough to call it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool takes zero parameters, so there is no parameter meaning for the description to add. Baseline 4 applies; no schema gaps exist to compensate for.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific resource (adding a client in the user's own My PT Hub account) and clarifies the real behavior: it returns an instructional guide rather than performing the action. That correction is important because the tool name and first clause ('Add client...') suggest a mutation, but the second sentence explicitly says it 'opens nothing by itself'. It is distinct from the cotlet_browser_* siblings, which it names as the actual execution path.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description lays out a clear two-step workflow: call this to get the step-by-step guide, then execute with the cotlet_browser_* tools in the user's My PT Hub Cloud Browser. It does not name exclusions or tell the agent when to prefer alternatives such as my_pt_hub_list_clients or cotlet_app_guide, so the guidance is clear but not exhaustive.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.